METHOD FOR FORMING MASK PLATE FOR FORMING INK EJECTION NOZZLE

摘要

PROBLEM TO BE SOLVED: To form a mask plate having a circular nozzle with high accuracy by a laser processing. SOLUTION: There is provided a processing device comprising a processing optical system having a laser oscillator, a beam shaping element that controls a laser light emitted from the laser oscillator to be circular and a group of lenses for forming an image of the beam shaping element and a moving means capable of moving and positioning itself in at least one direction in a plane perpendicular to a laser emission angle. Two mask plate materials each made of a plate of an alloy not including iron content in a main component or a non-ferrous metal are superposed and a laser light is emitted on the superposed mask plate materials 47 at predetermined positions by means of the processing device to form a plurality of circular holes 57. One the superposed mask plate materials 47 on a side to which the laser light is emitted is utilized for a mask plate 60 for forming ink ejection nozzles.